401409857 has 2 divisors, whose sum is σ = 401409858. Its totient is φ = 401409856.

The previous prime is 401409839. The next prime is 401409871. The reversal of 401409857 is 758904104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210859441 + 190550416 = 14521^2 + 13804^2 .

It is a cyclic number.

It is not a de Polignac number, because 401409857 - 2²⁰ = 400361281 is a prime.

It is a super-2 number, since 2×401409857² = 322259746593520898, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401409857.

It is not a weakly prime, because it can be changed into another prime (401409157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200704928 + 200704929.

It is an arithmetic number, because the mean of its divisors is an integer number (200704929).

Almost surely, 2^401409857 is an apocalyptic number.

It is an amenable number.

401409857 is a deficient number, since it is larger than the sum of its proper divisors (1).

401409857 is an equidigital number, since it uses as much as digits as its factorization.

401409857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 401409857 is about 20035.2154218516. The cubic root of 401409857 is about 737.6709442675.

The spelling of 401409857 in words is "four hundred one million, four hundred nine thousand, eight hundred fifty-seven".